Re: SQL Question ... how to SETGT, READPE in SQL

Sorry, I didn't realize that you needed all the fields in the record with
the latest time_stamp. Try this "subquery" technique which assumes
that the id,time_stamp will be unique for each record.

SELECT * FROM table_name
WHERE (id, time_stamp) IN
(SELECT id, MAX(time_stamp) FROM table_name
GROUP BY id )

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Re: SQL Question ... how to SETGT, READPE in SQL






Would this be it?

SELECT id, MAX(time_stamp), data_field_1, data_field_2, data_field_3 FROM

table_name
GROUP BY id, data_field_1, data_field_2, data_field_3





Bill Blalock/TUS/US/Certegy@Certegy
07/26/2007 04:35 PM
Please respond to Java Programming on and around the iSeries / AS400

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Subject: Re: SQL Question ... how to SETGT, READPE in SQL


Ed:
Lets say the table (database) contains these fields
id
time_stamp
data_field_1
data_field_2
data_field_3
I could not make the example get the last record, that is data_field_1,
data_field_2, data_field_3 for the most recent record for each id.
Any thoughts?





eegbert@xxxxxxxxxxxxxxxxxx
07/26/2007 04:09 PM
Please respond to Java Programming on and around the iSeries / AS400

To: Java Programming on and around the iSeries / AS400
<java400-l@xxxxxxxxxxxx>
cc: (bcc: Bill Blalock/TUS/US/Certegy)
Subject: Re: SQL Question ... how to SETGT, READPE in SQL

You could try:
SELECT id, MAX(time_stamp) FROM table_name
GROUP BY id
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be aware the disclosure, copying, distribution or use of the contents of
this information is prohibited. If you have received this electronic
transmission in error, please notify us by telephone (605-721-2100)
immediately.
Ed Egbert
Black Hills Corp. IS division
1140 Plant Street
Rapid City, SD 57709
(605) 721-2137
"The only ones among you who will be really happy are those who have
sought and found how to serve."
-- Albert Schweitzer


bill.blalock@xxxxxxxxxxx
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SQL Question ... how to SETGT, READPE in SQL




Is there a simple way to select the last record in a series? Say the most


recent record of a set using a timestamp.
For example, a data base record with
id
time_stamp
data fields
In RPG one could create a logical file, or OPNQRYF with keys
id
time_stamp
To get the last record for each id one could
set id to *LOVAL
repeat until end of file
SETGT
READPE
Can you do this with SQL (hence with Java) ... or should you drop back to
relative record access with JT400?
Thanks all
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